CN102299691A - Multi-input differential amplifier and light emitting element driving device - Google Patents
Multi-input differential amplifier and light emitting element driving device Download PDFInfo
- Publication number
- CN102299691A CN102299691A CN2011101428747A CN201110142874A CN102299691A CN 102299691 A CN102299691 A CN 102299691A CN 2011101428747 A CN2011101428747 A CN 2011101428747A CN 201110142874 A CN201110142874 A CN 201110142874A CN 102299691 A CN102299691 A CN 102299691A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- field
- input
- effect transistor
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Led Devices (AREA)
Abstract
A multi-input differential amplifying device of the present invention includes: a differential amplifier having an inverting input terminal and a non-inverting input terminal; and an input portion configured to apply a first input voltage to a first input terminal that is one of the inverting input terminal and the non-inverting input terminal and apply a second input voltage to a second input terminal that is the other input terminal, the first input voltage corresponding to first input signals that are a plurality of input signals for the first input terminal, the second input voltage corresponding to a second input signal that is one input signal for the second input terminal. The input portion is configured to correct an offset voltage between the first input voltage and the second input voltage.
Description
Technical field
The present invention relates to many inputs differential amplifier that the difference between many inputs is amplified and use this light-emitting component drive apparatus of importing differential amplifiers more.
Background technology
In the common differential amplifier, respectively to reversed input terminal and 1 input signal of non-inverting input input.In so common differential amplifier, it is known (for example, with reference to patent documentation 1 and patent documentation 2) that the current potential of back of the body grid (back gate) that constitutes the field-effect transistor of this differential amplifier by control is eliminated the scheme that input departs from (offset).
Fig. 6 is the figure of structure of the differential amplifier shown in Figure 4 of expression patent documentation 1.As shown in Figure 6, in this differential amplifier in the past, detect bias, and the current potential of the back of the body grid of the field-effect transistor that constitutes differential amplifier is controlled, make and eliminate detected departing from.
On the other hand, for example, among Fig. 2 of patent documentation 3, a kind of selection circuit is disclosed, be formed in the differential amplifier as a whole, import a plurality of reverse inter-input-ing voltage signals, and the output voltage of this differential amplifier is imported as noninverting input voltage signal.According to patent documentation 3,, select the minimum voltage signal in a plurality of reverse inter-input-ing voltage signals and export via voltage follower according to this structure.
[prior art document]
[patent documentation]
No. 4031447 communique of [patent documentation 1] Japan Patent (particularly Fig. 4)
[patent documentation 2] TOHKEMY 2004-020867 communique
[patent documentation 3] TOHKEMY 2003-332624 communique (particularly Fig. 2)
But, in differential amplifying device, there is following situation, that is: the side in rp input signal and the noninverting input signal is a plurality of, suitably these a plurality of input signals are selected, and wished the difference between the opposing party in this signal of selecting and rp input signal and the noninverting input signal is amplified.In this case, need under the condition that does not produce offset voltage, amplify rp input signal and noninverting input signal.
But the differential amplifier that patent documentation 1 and patent documentation 2 are put down in writing is the differential amplifier of an input, selects and amplifies so can't import a plurality of input signals.
In addition, the selection circuit that patent documentation 3 is put down in writing is only selected a plurality of reverse inter-input-ing voltage signals, can't amplify to the signal selected and from the difference between the noninverting input signal of outside input.
Summary of the invention
The present invention proposes in order to solve this problem, purpose is, a kind of many input amplification devices are provided, side in rp input signal and the noninverting input signal is a plurality of, can select these a plurality of input signals, and the difference between the opposing party in this signal of selecting and rp input signal and the noninverting input signal is amplified.
For solving above-mentioned problem, the differential amplifying device of many inputs of the present invention possesses: differential amplifier has reversed input terminal and non-inverting input; And input part, input terminal (hereinafter referred to as first input end) to a side of above-mentioned reversed input terminal and above-mentioned non-inverting input, apply corresponding first input voltage of input signal (hereinafter referred to as first input signal) with the sub-usefulness of a plurality of these first input ends, and, input terminal (hereinafter referred to as second input terminal) to the opposing party of above-mentioned reversed input terminal and above-mentioned non-inverting input, apply corresponding second input voltage of using with this second input terminal of input signal (hereinafter referred to as second input signal), above-mentioned input part constitutes the offset voltage of proofreading and correct between above-mentioned first input voltage and above-mentioned second input voltage.
Above-mentioned input part possesses and the corresponding a plurality of input circuits of a plurality of above-mentioned first input signals, and each above-mentioned input circuit comprises: first field-effect transistor, and source electrode is connected with above-mentioned first input end, and grid is transfused to corresponding above-mentioned first input signal; Second field-effect transistor, source electrode is connected with above-mentioned second input terminal, and grid is transfused to above-mentioned second input signal; And the back grid potential control circuit, constitute: the drain current control corresponding voltage of generation and above-mentioned first field-effect transistor, and the control voltage that will generate is applied to the back of the body grid of above-mentioned first field-effect transistor and the back of the body grid of second field-effect transistor.
Above-mentioned back grid potential control circuit can constitute and generate control voltage, this control voltage makes: if the drain current of above-mentioned first field-effect transistor increases, the drain electrode of then above-mentioned first field-effect transistor and above-mentioned second field-effect transistor and the impedance between the source electrode reduce, if the drain current of above-mentioned first field-effect transistor reduces, the drain electrode of then above-mentioned first field-effect transistor and above-mentioned second field-effect transistor and the impedance between the source electrode increase.
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor can be the P channel type field effect transistors.
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor can be the N channel type field effect transistors.
In addition, light-emitting component drive apparatus of the present invention possesses: power supply unit applies supply voltage to a plurality of light-emitting components and a plurality of current paths that these a plurality of light-emitting components are provided the driver of electric current to be connected in series to form; The differential amplifying device of above-mentioned many inputs, the voltage that puts on the above-mentioned driver of above-mentioned a plurality of current paths is used as a plurality of above-mentioned first input signals and is input to above-mentioned input part, reference voltage is used as above-mentioned second input signal and is input to above-mentioned input part, and, from above-mentioned differential amplifier, said reference voltage and the error that puts between the voltage of above-mentioned driver of above-mentioned a plurality of current paths are amplified output; And control part, based on the above-mentioned outputs of importing the differential amplifier of differential amplifying device, the supply voltage that above-mentioned power supply applied is carried out FEEDBACK CONTROL more.
The invention effect
The present invention constitutes as described above and has following effect: the side in rp input signal and the noninverting input signal is for a plurality of, can select these a plurality of input signals, and the difference between the opposing party in this signal of selecting and rp input signal and the noninverting input signal is amplified.
Description of drawings
Fig. 1 is the circuit diagram of structure of many inputs differential amplifier of expression embodiments of the present invention 1.
Fig. 2 is the circuit of the structure example of the back grid potential control circuit in many inputs differential amplifier of presentation graphs 1.
Fig. 3 is the circuit diagram of structure of many inputs differential amplifier of expression embodiments of the present invention 2.
Fig. 4 is the circuit of the structure example of the back grid potential control circuit in many inputs differential amplifier of presentation graphs 3.
Fig. 5 is the circuit diagram of structure of the light-emitting component drive apparatus of expression embodiments of the present invention 3.
Fig. 6 is a circuit diagram of representing the structure of differential amplifier in the past.
Symbol description
1 differential amplifier
2 input parts
3～5 input circuits
3a, 4a, 5a first field-effect transistor
3b, 4b, 5b second field-effect transistor
3c, 4c, 5c back grid potential control circuit
6 first current sources
7 second current sources
13～15 input circuits
13a, 14a, 15a first field-effect transistor
13b, 14b, 15b second field-effect transistor
13c, 14c, 15c back grid potential control circuit
21,31 current-voltage conversion elements
22,32 voltage-to-current conversion elements
23,33 current-voltage conversion elements
41 power supply units
42 control parts
43 light-emitting components
44 drivers
45 reference voltage power supplys
100A, 100B imports differential amplifier more
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.In addition, in following all figure, identical or corresponding key element is given identical reference marks and omitted repeat specification.
(execution mode 1)
Fig. 1 is the circuit diagram of structure of many inputs differential amplifier of expression embodiments of the present invention 1.
As shown in Figure 1, many inputs differential amplifier 100A of present embodiment 1 possesses differential amplifier 1 and input part 2.
Differential amplifier 1 adopts known structure.Here, " differential amplifier " comprising: have regulation magnification ratio differential amplifier and have these both sides of operational amplifier (operational amplifier) of infinitely-great magnification ratio in fact.
Particularly, to input part 2 inputs a plurality of (for example being 3 here) rp input signal IN-1～IN-3 as first input signal.Input part 2 possesses a plurality of (here be 3) input circuit 3～5 corresponding with these a plurality of rp input signal IN-1～IN-3.
Each input circuit 3～5 comprises: as the first field-effect transistor 3a, 4a, the 5a of the amplifier element of rp input signal, as the second field-effect transistor 3b, 4b, the 5b of the amplifier element of noninverting input signal, and back grid potential control circuit 3c, 4c, 5c.Here, the first field-effect transistor 3a of each input circuit 3～5,4a, 5a and the second field-effect transistor 3b, 4b, 5b are made of P channel type field effect transistors (for example P channel-type MOSFET).In addition, be preferably, the first field-effect transistor 3a, 4a, 5a are made of the identical in fact field-effect transistor of size with the second field-effect transistor 3b, 4b, 5b.
The first field-effect transistor 3a of each input circuit 3～5, the source electrode of 4a, 5a are connected to the reversed input terminal and first current source 6 of differential amplifier 1.Here, first current source 6 is connected with positive supply Vdd, and certain electric current is provided.In addition, the first field-effect transistor 3a of each input circuit 3～5, the drain electrode of 4a, 5a are connected with earth terminal via the current-voltage conversion element 21 (with reference to Fig. 2) of back grid potential control circuit 3c described later, 4c, 5c.And the first field-effect transistor 3a of each input circuit 3～5, the grid of 4a, 5a are transfused to corresponding rp input signal IN-1～IN-3.
On the other hand, the source electrode of the second field-effect transistor 3b of each input circuit 3～5,4b, 5b is connected to non-inverting input and second current source 7 of differential amplifier 1.Here, second current source 7 is connected with positive supply Vdd, and certain electric current is provided.In addition, the drain electrode of the second field-effect transistor 3b of each input circuit 3～5,4b, 5b is connected (ground connection) with earth terminal.And the second field-effect transistor 3b of each input circuit 3～5, the grid of 4b, 5b are transfused to a noninverting input signal IN+.
Each back grid potential control circuit 3c, 4c, 5c constitute, generate and the first field-effect transistor 3a of corresponding input circuit 3,4,5, the drain current control corresponding voltage of 4a, 5a, and the control voltage of this generation is applied to the back of the body grid of the back of the body grid of the first field-effect transistor 3a, 4a, 5a of corresponding input circuit 3～5 and the second field-effect transistor 3b, 4b, 5b.Particularly, each back grid potential control circuit 3c, 4c, 5c constitutes, generate control voltage, this control voltage makes: if the first field-effect transistor 3a, 4a, the drain current of 5a increases, this first field-effect transistor 3a then, 4a, the 5a and the second field-effect transistor 3b, 4b, the drain electrode of 5b and the impedance between the source electrode (essence is resistance: hereinafter referred to as internal driving) reduce, if the first field-effect transistor 3a, 4a, the drain current of 5a reduces, then this first field-effect transistor 3a, 4a, the 5a and the second field-effect transistor 3b, 4b, the internal driving of 5b increases.
Fig. 2 is the circuit of the structure example of the back grid potential control circuit in many inputs differential amplifier of presentation graphs 1.
As shown in Figure 2, back grid potential control circuit 3c, 4c, 5c possess the current-voltage conversion element 21 that connects with the drain electrode of 3a, the 4a of first field-effect transistor of corresponding input circuit 3,4,5,5a.Current-voltage conversion element 21 is by for example having carried out N channel type field effect transistors (for example N channel-type MOSFET) formation that diode connects.The drain electrode of current-voltage conversion element 21 connects (representing tie point with IN among Fig. 2) with 3a, the 4a of first field-effect transistor of corresponding input circuit 3,4,5, the drain electrode of 5a, and the source electrode of current-voltage conversion element 21 is connected with earth terminal.In addition, the grid of current-voltage conversion element 21 is connected with the drain electrode of self, and is connected with the grid of voltage-to-current conversion element 22.Voltage-to-current conversion element 22 is made of for example N channel type field effect transistors (for example N channel-type MOSFET).In addition, be preferably, current-voltage conversion element 21 is made of the identical in fact field-effect transistor of size with voltage-to-current conversion element 22.The source electrode of voltage-to-current conversion element 22 is connected with earth terminal, and the drain electrode of voltage-to-current conversion element 22 is connected with positive supply Vdd via current-voltage conversion element 23.Current-voltage conversion element 23 is by for example having carried out P channel type field effect transistors (for example P channel-type MOSFET) formation that diode connects.The drain electrode of current-voltage conversion element 23 is connected with the grid of self, and is connected with the drain electrode of voltage-to-current conversion element 22, and the source electrode of current-voltage conversion element 23 is connected with positive supply Vdd.And, the voltage of tie point OUT between the drain electrode of the drain electrode of voltage-to-current conversion element 22 and current-voltage conversion element 23 is used as control voltage and is applied to the first field-effect transistor 3a, the back of the body grid of 4a, 5a and 3b, the 4b of second field-effect transistor of corresponding input circuit 3～5, the back of the body grid (with reference to Fig. 1) of 5b.In addition, also can constitute current-voltage conversion element 23 by resistive element.
Sum up above structure, that is, between the earth terminal and first current source 6 that is connected with positive supply Vdd, the first field-effect transistor 3a, 4a, the 5a that is connected with the rp input signal amplification usefulness of a plurality of (being 3) input circuit 3～5 here parallel with one another.And the tie point between the source electrode of first current source 6 and a plurality of first field-effect transistor 3a, 4a, 5a is connected with the reversed input terminal of differential amplifier 1.In addition, between the earth terminal and second current source 7 that is connected with positive supply Vdd, the noninverting input signal that is connected with a plurality of input circuits 3～5 amplifies the second field-effect transistor 3b, 4b, the 5b of usefulness parallel with one anotherly.And the tie point between the source electrode of second current source 7 and a plurality of second field-effect transistor 3b, 4b, 5b is connected with the non-inverting input of differential amplifier 1.And in each input circuit 3～5, the grid of the first field-effect transistor 3a, 4a, 5a is transfused to corresponding rp input signal IN-1～IN-3, and the grid of the second field-effect transistor 3b, 4b, 5b is transfused to a noninverting input signal IN+.In addition, in each input circuit 3～5, the back of the body grid separately of a pair of first field-effect transistor 3a, 4a, 5a and the second field-effect transistor 3b, 4b, 5b are applied drain current control corresponding voltage with this first field-effect transistor 3a, 4a, 5a by back grid potential control circuit 3c, 4c, 5c from correspondence.
[action]
Then, the action of pressing the many inputs differential amplifier that constitutes as upper type is described.
In Fig. 1 and Fig. 2, if a plurality of rp input signal IN-1～IN-3 of input and 1 noninverting input signal IN+, then in each input circuit 3～5, flow through and corresponding rp input signal IN-1～IN-3 corresponding drain electrode electric current at the first field-effect transistor 3a, 4a, 5a, and, flow through and 1 noninverting input signal IN+ corresponding drain electrode electric current at the second field-effect transistor 3b, 4b, 5b.Particularly, in each input circuit 3～5, the internal driving of the first field-effect transistor 3a, 4a, 5a becomes and the corresponding corresponding impedance of rp input signal IN-1～IN-3, and the internal driving of the second field-effect transistor 3b, 4b, 5b becomes the corresponding impedance with noninverting input signal IN+.Thus, the certain electric current that provides from first current source 6 is shunted inversely with a plurality of first field-effect transistor 3a, 4a, 5a internal driving separately and is flowed to a plurality of first field-effect transistor 3a, 4a, 5a.As a result, flow through and corresponding rp input signal IN-1～IN-3 corresponding drain electrode electric current to the first field-effect transistor 3a, 4a, 5a.In this case, grid is transfused to the drain current of the first field-effect transistor 3a, 4a, 5a of the rp input signal IN-1～IN-3 of magnitude of voltage minimum (little) among rp input signal IN-1～IN-3 for maximum.In addition, from certain electric current that second current source 7 provides, shunted and flowed to a plurality of second field-effect transistor 3b, 4b, 5b inversely with a plurality of second field-effect transistor 3b, 4b, 5b internal driving separately.As a result, flow through and a noninverting input signal IN+ corresponding drain electrode electric current at the second field-effect transistor 3b, 4b, 5b.In this case, the size of the drain current of each second field-effect transistor 3b, 4b, 5b is identical in fact.
Because a plurality of first field-effect transistor 3a, 4a, 5a connect parallel with one anotherly, therefore, tie point place between the source electrode of first current source 6 and a plurality of first field-effect transistor 3a, 4a, 5a, these a plurality of first field-effect transistor 3a, 4a, 5a are commonly generated long-pending correspondent voltage with internal driving and the drain current of the first field-effect transistor 3a, 4a, 5a, and this voltage is applied to the reversed input terminal of differential amplifier 1.Thus, rp input signal IN-1～IN-3 is selected and become one and be applied to the reversed input terminal of differential amplifier 1 by a plurality of first field-effect transistor 3a, 4a, 5a.
In addition, because a plurality of second field-effect transistor 3b, 4b, 5b connect parallel with one anotherly, therefore the tie point place between the source electrode of second current source 7 and a plurality of second field-effect transistor 3b, 4b, 5b, these a plurality of second field-effect transistor 3b, 4b, 5b are commonly generated and the long-pending correspondent voltage of internal driving and the drain current of the second field-effect transistor 3b, 4b, 5b (amplify noninverting input signal after voltage), and this voltage is applied to non-inverting input of differential amplifier 1.Thus, noninverting input signal IN+ is selected by a plurality of second field-effect transistor 3b, 4b, 5b and becomes one and be applied to non-inverting input of differential amplifier 1.
On the other hand, among the back grid potential control circuit 3c of each input circuit 3～5,4c, the 5c, two ends at current-voltage conversion element 21, generate and the first corresponding field-effect transistor 3a, the drain current correspondent voltage of 4a, 5a, this voltage is applied to the grid of voltage-to-current conversion element 22.Thus, flow through and this voltage corresponding drain electrode electric current, generate and this drain current correspondent voltage at the two ends of current-voltage conversion element 23 at voltage-to-current conversion element 22.Thus, the tie point OUT place formation voltage between voltage-to-current conversion element 22 and current-voltage conversion element 23, this voltage is along with the first field-effect transistor 3a of correspondence, the drain current of 4a, 5a increase and reduce.The voltage of this tie point OUT is applied to the back of the body grid of the first corresponding field-effect transistor 3a, 4a, 5a and the second corresponding field-effect transistor 3b, the back of the body grid of 4b, 5b as control voltage.
Like this, the threshold voltage of this first field-effect transistor 3a, 4a, 5a and this second field-effect transistor 3b, 4b, 5b improves respectively that (the first field-effect transistor 3a, 4a, 5a are the P channel-type, so threshold voltage is a negative value.The absolute value of threshold voltage reduces.), internal driving separately reduces.
Thus, among a plurality of first field-effect transistor 3a, 4a, the 5a, grid is transfused to the first field-effect transistor 3a of the rp input signal IN-1～IN-3 with minimum voltage value, the drain current of 4a, 5a increases, with this recruitment correspondingly, the drain current of other first field-effect transistors 3a, 4a, 5a reduces.And, the variation of this drain current among each first field-effect transistor 3a, 4a, the 5a is fed back to corresponding back grid potential control circuit 3c, 4c, 5c, grid is transfused to the first field-effect transistor 3a of the rp input signal IN-1～IN-3 with minimum voltage value, further raising of threshold voltage and the drain current of 4a, 5a further increases, and the threshold voltage of other first field-effect transistors 3a, 4a, 5a further reduces and drain current further reduces.So final, the major part (being preferably all) of the electric current that provides from first current source 6 flows to the first field-effect transistor 3a, 4a, the 5a that grid is transfused to the rp input signal IN-1～IN-3 with minimum voltage value as drain current.Be applied to the reversed input terminal of differential amplifier 1 with the long-pending correspondent voltage of the internal driving of the first field-effect transistor 3a of this state, 4a, 5a and drain current.
Thus, from a plurality of rp input signal IN-1～IN-3, preferential selection has the rp input signal IN-1～IN-3 of minimum voltage value and is applied to the reversed input terminal of differential amplifier 1.
On the other hand, a plurality of second field-effect transistor 3b, 4b, 5b are if internal driving separately reduces, then among them be transfused to the second field-effect transistor 3b of the same input circuit 3～5 of the first field-effect transistor 3a, 4a, the 5a of the rp input signal IN-1～IN-3 with minimum voltage value with grid, the drain current of 4b, 5b increases, with the amount of this increase correspondingly, the drain current of other second field-effect transistors 3b, 4b, 5b reduces.So, finally, the major part of the certain electric current that provides from second current source 7 (being preferably all), as with grid be transfused to the same input circuit 3～5 of the first field-effect transistor 3a, 4a, the 5a of the rp input signal IN-1～IN-3 with minimum voltage value the second field-effect transistor 3b, 4b, 5b drain current and flow.Be applied to non-inverting input of differential amplifier 1 with the long-pending correspondent voltage of the internal driving of the second field-effect transistor 3b of this state, 4b, 5b and drain current.
Thus, among a plurality of second field-effect transistor 3b, 4b, 5b, select the second field-effect transistor 3b, 4b, the 5b of the input circuit 3～5 corresponding with the rp input signal IN-1～IN-3 with minimum voltage value, the noninverting signal IN+ of grid that is input to this second field-effect transistor 3b that selects, 4b, 5b is by this second field-effect transistor 3b, 4b, 5b and selected and be applied to non-inverting input of differential amplifier 1.And, the back of the body grid of the first field-effect transistor 3a of same input circuit 3～5, the back of the body grid of 4a, 5a and the second field-effect transistor 3b, 4b, 5b are owing to be applied in same control voltage, therefore, the back of the body is applied in control voltage on the grid and threshold value changes, and prevents from the voltage of the reversed input terminal that is input to differential amplifier 1 thus and be input to produce between the voltage of non-inverting input of differential amplifier 1 to depart from.
Here, in fact therefore the instantaneous process of transition state discussed above show final state.Thus, from differential amplifier 1, the rp input signal and the difference between the noninverting signal IN+ that have minimum voltage value among a plurality of rp input signal IN-1～IN-3 are amplified and output.
As mentioned above, many inputs differential amplifier according to present embodiment, that can select that 1 input signal (input signal that magnitude of voltage is minimum) among a plurality of rp input signal IN-1～IN-3 become with 1 noninverting input signal IN+ is right, and the difference of both sides' signal is amplified output (carrying out the amplification of the difference of the selection of input signal and input signal in fact simultaneously).And, prevent that 1 input signal among selecting a plurality of rp input signal IN-1～IN-3 from being become with 1 noninverting input signal IN+ to the time generation depart from.
(execution mode 2)
Fig. 3 is the circuit diagram of structure of many inputs differential amplifier of expression embodiments of the present invention 2.
Different being of many inputs differential amplifier 100B of present embodiment 2 and many inputs differential amplifier 100A of execution mode 1, be constructed such that the rp input signal IN-1～IN-3 that selects to have among a plurality of rp input signal IN-1～IN-3 maximum voltage value (greatly), other many inputs differential amplifier 100A with execution mode 1 are identical.
In input part 2, each input circuit 13～15 comprises the first field-effect transistor 13a as the selection element of rp input signal, 14a, 15a, as the second field-effect transistor 13b, 14b, 15b and back grid potential control circuit 13c, 14c, the 15c of the selection element of noninverting input signal.Here, the first field-effect transistor 13a of each input circuit 13～15,14a, 15a and the second field-effect transistor 13b, 14b, 15b are made of N channel type field effect transistors (for example N channel-type MOSFET).In addition, be preferably, the first field-effect transistor 13a, 14a, 15a are made of the identical in fact field-effect transistor of size with the second field-effect transistor 13b, 14b, 15b.The first field-effect transistor 13a of each input circuit 13～15, the source electrode of 14a, 15a are connected to the reversed input terminal and first current source 6 of differential amplifier 1.Here, first current source 6 is connected (ground connection) with earth terminal, certain electric current is provided.In addition, the drain electrode of the first field-effect transistor 13a of each input circuit 13～15,14a, 15a is connected with positive supply Vdd via the current-voltage conversion element 31 (with reference to Fig. 4) of back grid potential control circuit 13c described later, 14c, 15c.And the first field-effect transistor 13a of each input circuit 13～15, the grid of 14a, 15a are transfused to corresponding rp input signal IN-1～IN-3.
On the other hand, the source electrode of the second field-effect transistor 13b of each input circuit 13～15,14b, 15b is connected to non-inverting input and second current source 7 of differential amplifier 1.Here, second current source 7 is connected (ground connection) with earth terminal, certain electric current is provided.In addition, the drain electrode of the second field-effect transistor 13b of each input circuit 13～15,14b, 15b is connected with positive supply Vdd.And the second field-effect transistor 13b of each input circuit 13～15, the grid of 14b, 15b are transfused to a noninverting input signal IN+.
Each back grid potential control circuit 13c, 14c, 15c constitute and generate and 13a, the 14a of first field-effect transistor of corresponding input circuit 13,14,15, the drain current control corresponding voltage of 15a, and the control voltage that will generate is applied to the back of the body grid of the back of the body grid of the first field- effect transistor 13a, 14a, 15a of the input circuit 13～15 of correspondence and the second field- effect transistor 13b, 14b, 15b.Particularly, each back grid potential control circuit 13c, 14c, 15c constitute and generate control voltage, this control voltage makes: if the drain current of the first field- effect transistor 13a, 14a, 15a increases, then the internal driving of this first field- effect transistor 13a, 14a, 15a and the second field- effect transistor 13b, 14b, 15b reduces, if the drain current of the first field- effect transistor 13a, 14a, 15a reduces, then the internal driving of this first field- effect transistor 13a, 14a, 15a and the second field- effect transistor 13b, 14b, 15b increases.
Fig. 4 is the circuit of the structure example of the back grid potential control circuit in many inputs differential amplifier of presentation graphs 3.
As shown in Figure 4, back grid potential control circuit 13c, 14c, 15c have the current-voltage conversion element 31 that connects with the drain electrode of 13a, the 14a of first field-effect transistor of corresponding input circuit 13,14,15,15a.Current-voltage conversion element 31 is by for example having carried out P channel type field effect transistors (for example P channel-type MOSFET) formation that diode connects.The drain electrode of current-voltage conversion element 31 is connected to 13a, the 14a of first field-effect transistor of corresponding input circuit 13,14,15, the drain electrode (representing tie point with IN in Fig. 4) of 15a, and the source electrode of current-voltage conversion element 31 is connected with positive supply Vdd.In addition, the grid of current-voltage conversion element 31 is connected with the drain electrode of self, and is connected with the grid of voltage-to-current conversion element 32.Voltage-to-current conversion element 32 is made of for example P channel type field effect transistors (for example P channel-type MOSFET).In addition, be preferably, current-voltage conversion element 31 is made of the identical in fact field-effect transistor of size with voltage-to-current conversion element 32.The source electrode of voltage-to-current conversion element 32 is connected with positive supply Vdd, and the drain electrode of voltage-to-current conversion element 32 is connected with earth terminal via current-voltage conversion element 33.Current-voltage conversion element 33 is by for example having carried out N channel type field effect transistors (for example N channel-type MOSFET) formation that diode connects.The drain electrode of current-voltage conversion element 33 is connected with the grid of self, and is connected with the drain electrode of voltage-to-current conversion element 32, and the source electrode of current-voltage conversion element 33 is connected with earth terminal.And, the voltage of tie point OUT between the drain electrode of the drain electrode of voltage-to-current conversion element 32 and current-voltage conversion element 33 is used as control voltage and is applied to 13a, 14a, the back of the body grid of 15a and 13b, the 14b of second field-effect transistor of first field-effect transistor of corresponding input circuit 13～15, the back of the body grid (with reference to Fig. 3) of 15b.In addition, current-voltage conversion element 33 also can be made of resistive element.
Sum up above structure, between the positive supply Vdd and first current source 6 that is connected with earth terminal, be connected with the first field-effect transistor 13a, 14a, the 15a of the rp input signal amplification usefulness of a plurality of (being 3 here) input circuit 13～15 parallel with one anotherly.And the tie point between the source electrode of first current source 6 and a plurality of first field-effect transistor 13a, 14a, 15a is connected with the reversed input terminal of differential amplifier 1.In addition, between the positive supply Vdd and second current source 7 that is connected with earth terminal, the noninverting input signal that is connected with a plurality of input circuits 13～15 in parallel amplifies the second field-effect transistor 13b, 14b, the 15b of usefulness.And, second current source 7 and a plurality of second field-effect transistor 13b, 14b, the tie point between the source electrode of 15b is connected with non-inverting input of differential amplifier 1.And, in each input circuit 13～15, the grid of the first field-effect transistor 13a, 14a, 15a is transfused to corresponding rp input signal IN-1～IN-3, and the grid of the second field-effect transistor 13b, 14b, 15b is transfused to a noninverting input signal IN+.In addition, in each input circuit 13～15, at the back of the body grid separately of a pair of first field-effect transistor 13a, 14a, 15a and the second field-effect transistor 13b, 14b, 15b, applied drain current control corresponding voltage with this first field-effect transistor 13a, 14a, 15a by back grid potential control circuit 13c, 14c, 15c from correspondence.
[action]
The action of the many inputs differential amplifier that as above constitutes then, is described.
In Fig. 3 and Fig. 4, if a plurality of rp input signal IN-1～IN-3 of input and 1 noninverting input signal IN+, then in each input circuit 13～15, flow through and corresponding rp input signal IN-1～IN-3 corresponding drain electrode electric current at the first field-effect transistor 13a, 14a, 15a, and, flow through and 1 noninverting input signal IN+ corresponding drain electrode electric current at the second field-effect transistor 13b, 14b, 15b.Particularly, in each input circuit 13～15, the internal driving of the first field-effect transistor 13a, 14a, 15a becomes and the corresponding corresponding impedance of rp input signal IN-1～IN-3, and the internal driving of the second field-effect transistor 13b, 14b, 15b becomes the corresponding impedance with noninverting input signal IN+.Thus, by certain electric current that first current source 6 is provided, shunted inversely with a plurality of first field-effect transistor 13a, 14a, 15a internal driving separately, and flowed to a plurality of first field-effect transistor 13a, 14a, 15a.As a result, flow through and corresponding rp input signal IN-1～IN-3 corresponding drain electrode electric current to the first field-effect transistor 13a, 14a, 15a.In this case, grid is transfused to the first field-effect transistor 13b of the rp input signal IN-1～IN-3 of magnitude of voltage the highest (greatly) among rp input signal IN-1～IN-3, the drain current maximum of 14b, 15b.In addition, the certain electric current that is provided by second current source 7 is shunted inversely with a plurality of second field-effect transistor 13b, 14b, 15b internal driving separately and is flowed to a plurality of second field-effect transistor 13b, 14b, 15b.As a result, flow through and a noninverting input signal IN+ corresponding drain electrode electric current to the second field-effect transistor 13b, 14b, 15b.In this case, the size of the drain current of each second field-effect transistor 13b, 14b, 15b is identical in fact.
Because a plurality of first field- effect transistor 13a, 14a, 15a connect parallel with one anotherly, therefore, first current source 6 and a plurality of first field- effect transistor 13a, 14a, tie point place between the source electrode of 15a, these a plurality of first field- effect transistor 13a, 14a, 15a are commonly generated long-pending correspondent voltage with internal driving and the drain current of the first field- effect transistor 13a, 14a, 15a, and this voltage is applied to the reversed input terminal of differential amplifier 1.Thus, rp input signal IN-1～IN-3 is selected and become one and be applied to the reversed input terminal of differential amplifier 1 by a plurality of first field- effect transistor 13a, 14a, 15a.
In addition, because a plurality of second field- effect transistor 13b, 14b, 15b connect parallel with one anotherly, therefore, tie point place between the source electrode of second current source 7 and a plurality of second field- effect transistor 13b, 14b, 15b, these a plurality of second field- effect transistor 13b, 14b, 15b are commonly generated long-pending correspondent voltage with internal driving and the drain current of the second field- effect transistor 13b, 14b, 15b, and this voltage is applied to non-inverting input of differential amplifier 1.Thus, noninverting input signal IN+ is by a plurality of second field- effect transistor 13b, 14b, and 15b is selected and become one and be applied to non-inverting input of differential amplifier 1.
On the other hand, among the back grid potential control circuit 13c of each input circuit 13～15,14c, the 15c, two ends at current-voltage conversion element 31 generate and the first corresponding field-effect transistor 13a, the drain current correspondent voltage of 14a, 15a, and this voltage is applied to the grid of voltage-to-current conversion element 32.Thus, flow through and this voltage corresponding drain electrode electric current, generate and this drain current correspondent voltage at the two ends of current-voltage conversion element 33 to voltage-to-current conversion element 32.Thus, the tie point OUT between voltage-to-current conversion element 32 and current-voltage conversion element 33, the drain current that generates the first field-effect transistor 13a along with correspondence, 14a, 15a increase and the voltage that increases.The voltage of this tie point OUT is applied to the first corresponding field-effect transistor 13a, back of the body grid and the second corresponding field-effect transistor 13b, the back of the body grid of 14b, 15b of 14a, 15a as control voltage.
Like this, the threshold voltage of this first field- effect transistor 13a, 14a, 15a and this second field- effect transistor 13b, 14b, 15b reduces respectively, and internal driving separately reduces.
Thus, among a plurality of first field-effect transistor 13a, 14a, the 15a, grid is transfused to the first field-effect transistor 13a of the rp input signal IN-1～IN-3 with maximum voltage value, the drain current of 14a, 15a increases, with this recruitment correspondingly, the drain current of other first field-effect transistors 13a, 14a, 15a reduces.And, the variation of this drain current among each first field-effect transistor 13a, 14a, the 15a is fed back to corresponding back grid potential control circuit 13c, 14c, 15c, the threshold voltage that grid is transfused to the first field-effect transistor 13a, 14a, the 15a of the rp input signal IN-1～IN-3 with maximum voltage value further reduces and drain current further increases, and the threshold voltage of other first field-effect transistors 13a, 14a, 15a further improves and drain current further reduces.So, final, provide the major part (being preferably whole) of electric current by first current source 6, flow to the first field-effect transistor 13a, 14a, the 15a that grid is transfused to the rp input signal IN-1～IN-3 with maximum voltage value as drain current.Be applied to the reversed input terminal of differential amplifier 1 with the long-pending correspondent voltage of the internal driving of the first field-effect transistor 13a of this state, 14a, 15a and drain current.
Thus, from a plurality of rp input signal IN-1～IN-3, rp input signal IN-1～IN-3 that preferential selection has maximum voltage value is applied to the reversed input terminal of differential amplifier 1.
On the other hand, a plurality of second field- effect transistor 13a, 14a, 15a are if internal driving separately reduces, then among them be transfused to the second field-effect transistor 13b of the same input circuit 13～15 of the first field- effect transistor 13a, 14a, the 15a of the rp input signal IN-1～IN-3 with maximum voltage value with grid, the drain current of 14b, 15b increases, with this recruitment correspondingly, the drain current of other second field- effect transistors 13b, 14b, 15b reduces.So, finally, the major part (being preferably whole) of the certain electric current that provides by second current source 7, as with grid be transfused to the identical input circuit 13～15 of the first field- effect transistor 13a, 14a, the 15a of the rp input signal IN-1～IN-3 with maximum voltage value the second field- effect transistor 13a, 14a, 15a drain current and flow.Be applied to non-inverting input of differential amplifier 1 with the long-pending correspondent voltage of the internal driving of the second field-effect transistor 13b of this state, 14b, 15b and drain current.
Thus, from a plurality of second field- effect transistor 13b, 14b, among the 15b, selection has the second field- effect transistor 13b, 14b, the 15b of the pairing input circuit 13～15 of rp input signal IN-1～IN-3 of maximum voltage value, and the noninverting signal IN+ of grid that is input to this second field-effect transistor 13b that selects, 14b, 15b is by this second field-effect transistor 3b, 4b, 5b and selected and be applied to non-inverting input of differential amplifier 1.
And, because the back of the body grid of the first field-effect transistor 13a of same input circuit 13～15, the back of the body grid of 14a, 15a and the second field- effect transistor 13b, 14b, 15b are applied in same control voltage, therefore, the back of the body is applied in control voltage on the grid and threshold value changes, and prevents from the voltage of the reversed input terminal that is input to differential amplifier 1 thus and be input to produce between the voltage of non-inverting input of differential amplifier 1 to depart from.
Here, more than in fact therefore the instantaneous process of Shuo Ming transition state show final state.Thus, from differential amplifier 1, the reverse input signal and the difference between the noninverting signal IN+ that have maximum voltage value among a plurality of rp input signal IN-1～IN-3 are amplified and output.
As mentioned above, many inputs differential amplifier according to present embodiment, that can select that 1 input signal (input signal that magnitude of voltage is the highest) among a plurality of rp input signal IN-1～IN-3 become with 1 noninverting input signal IN+ is right, and the difference of both sides' signal is amplified output.And, prevent that 1 input signal among selecting a plurality of rp input signal IN-1～IN-3 from being become with 1 noninverting input signal IN+ to the time generation depart from.
(execution mode 3)
Embodiments of the present invention 3 examples illustrate the light-emitting component drive apparatus of the many inputs differential amplifier that adopts execution mode 1 with the application examples as many input differential amplifiers.
Fig. 5 is the circuit diagram of structure of the light-emitting component drive apparatus of expression embodiments of the present invention 3.
As shown in Figure 5, the light-emitting component drive apparatus of present embodiment possesses many inputs differential amplifier 100A of power supply unit 41, control part 42 and execution mode 1.
Power supply unit 41 for example is made of known boost chopper (chopper), to applying supply voltage with a plurality of LED as light-emitting component (light-emitting diode) 43 with to a plurality of (for example being 3 here) current path that these a plurality of LED43 provide the driver (constant-current source) 44 of the constant current of regulation to be connected in series to form.
As Fig. 1 and shown in Figure 5, for many inputs differential amplifier 100A, the voltage that puts on the driver 44 of a plurality of current paths is used as a plurality of rp input signals (first input signal) IN-1～IN-3 and is input to input part 2, and the reference voltage of reference voltage power supply 45 is used as noninverting input signal (second input signal) and is input to input part 2.This reference voltage is set to, and constitutes the suitable voltage that the transistor of driver 44 can (active region) moves in the service area.And,, this reference voltage and the error that puts between the minimum voltage among the voltage of driver 44 of a plurality of current paths are amplified back output from the differential amplifier 1 of many inputs differential amplifier 100A.This error is imported into control part 42.
42 pairs of supply voltages from power supply unit 41 outputs of control part carry out FEEDBACK CONTROL, make to reduce from the error of many inputs differential amplifier 100A input.
Thus, control is from the supply voltage of power supply unit 41 output, makes that the minimum voltage in the voltage of the driver 44 that puts on a plurality of current paths becomes reference voltage.As a result, the transistor that constitutes driver 44 always moves in the service area, and the constant current of regulation is provided to a plurality of LED of a plurality of current paths.Therefore, can make a large amount of LED stabilized illuminations.
(other execution modes)
Many inputs differential amplifier 100A, the 100B of execution mode 1 and execution mode 2 is if the differential amplifier of the magnification ratio of differential amplifier 1 by for example having regulation constitutes, then can use as many error originated from inputs amplifier, if differential amplifier 1 constitutes by for example operational amplifier, then can use as multi-input comparator.
In addition, above-mentioned in, as the power supply of low voltage side and example illustrates earth terminal, but the power supply of low voltage side is not limited thereto, as long as the voltage (current potential) lower than positive supply Vdd is provided.
In addition, above-mentioned in, it is a plurality of but not rp input signal is 1 a situation that example illustrates rp input signal, but also can noninverting input signal be a plurality of and rp input signal is 1.In this case, for example, in Fig. 1 and Fig. 3, the source electrode of a plurality of first field-effect transistors (3a etc.) is connected with non-inverting input of differential amplifier 1, and the source electrode of a plurality of second field-effect transistors (3b etc.) is connected with the reversed input terminal of differential amplifier 1 gets final product.
In addition, in above-mentioned, a plurality of first field-effect transistors (3a etc.) and a plurality of second field-effect transistor (3b etc.) are connected with constant current source 6,7 respectively in parallel, but also can replace constant current source 6,7 and employing has the circuit elements such as resistive element of certain resistance (impedance).
According to the above description, those skilled in the art can learn multiple improvement of the present invention and other execution modes.Therefore, above-mentioned explanation should be considered to illustration, and its purpose is to be used to carry out preferred plan of the present invention to those skilled in the art's enlightenment.In the scope that does not break away from purport of the present invention, can carry out substantial change to its concrete structure and/or function.
Industrial utilization
Many input differential amplifiers of the present invention are useful as the side in rp input signal and noninverting input signal for the suitable selection of a plurality of input signals and the signal that this is selected and the difference between the opposing party in rp input signal and the noninverting input signal are amplified to this under a plurality of situations differential amplifier etc.
In addition, light-emitting component drive apparatus of the present invention is useful as the light-emitting component drive apparatus that can make a large amount of light-emitting component stabilized illuminations etc.
Claims (8)
1. import differential amplifying device more one kind, possess:
Differential amplifier has reversed input terminal and non-inverting input; And
Input part, the input terminal of a side in above-mentioned reversed input terminal and above-mentioned non-inverting input is first input end, apply and i.e. corresponding first input voltage of first input signal of the input signal of the sub-usefulness of a plurality of these first input ends, and, the input terminal of the opposing party in above-mentioned reversed input terminal and above-mentioned non-inverting input i.e. second input terminal, and applying the input signal of using with this second input terminal is corresponding second input voltage of second input signal;
Above-mentioned input part constitutes the offset voltage of proofreading and correct between above-mentioned first input voltage and above-mentioned second input voltage.
2. as the differential amplifying device of many inputs of claim 1 record,
Above-mentioned input part possesses and the corresponding a plurality of input circuits of a plurality of above-mentioned first input signals;
Each above-mentioned input circuit comprises:
First field-effect transistor, source electrode is connected with above-mentioned first input end, and grid is transfused to corresponding above-mentioned first input signal;
Second field-effect transistor, source electrode is connected with above-mentioned second input terminal, and grid is transfused to above-mentioned second input signal; And
The back grid potential control circuit constitutes: the drain current control corresponding voltage of generation and above-mentioned first field-effect transistor, and the control voltage that will generate is applied to the back of the body grid of above-mentioned first field-effect transistor and the back of the body grid of second field-effect transistor.
3. as the differential amplifying device of many inputs of claim 2 record,
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor are the P channel type field effect transistors.
4. as the differential amplifying device of many inputs of claim 2 record,
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor are the N channel type field effect transistors.
5. as the differential amplifying device of many inputs of claim 2 record,
Above-mentioned back grid potential control circuit constitutes and generates following control voltage, this control voltage makes: if the drain current of above-mentioned first field-effect transistor increases, the drain electrode of then above-mentioned first field-effect transistor and above-mentioned second field-effect transistor and the impedance between the source electrode reduce, if the drain current of above-mentioned first field-effect transistor reduces, the drain electrode of then above-mentioned first field-effect transistor and above-mentioned second field-effect transistor and the impedance between the source electrode increase.
6. as the differential amplifying device of many inputs of claim 5 record,
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor are the P channel type field effect transistors.
7. the differential amplifying device of many inputs of claim 5 record,
Above-mentioned first field-effect transistor and above-mentioned second field-effect transistor are the N channel type field effect transistors.
8. light-emitting component drive apparatus possesses:
Power supply unit applies supply voltage to a plurality of current paths, these a plurality of current paths by a plurality of light-emitting components with provide the driver of electric current to be connected in series to these a plurality of light-emitting components to form;
The differential amplifying device of many inputs of each record in the claim 1～7, the voltage that puts on the above-mentioned driver of above-mentioned a plurality of current paths is input to above-mentioned input part as a plurality of above-mentioned first input signals, reference voltage is input to above-mentioned input part as above-mentioned second input signal, and, from above-mentioned differential amplifier, said reference voltage and the error that puts between the voltage of above-mentioned driver of above-mentioned a plurality of current paths are amplified and output; And
Control part based on the above-mentioned outputs of importing the differential amplifier of differential amplifying device, carries out FEEDBACK CONTROL to the supply voltage that above-mentioned power supply unit applied more.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010124902A JP2011254147A (en) | 2010-05-31 | 2010-05-31 | Multi input differential amplifier and light emitting element drive device |
| JP124902/2010 | 2010-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102299691A true CN102299691A (en) | 2011-12-28 |
Family
ID=45021532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101428747A Pending CN102299691A (en) | 2010-05-31 | 2011-05-30 | Multi-input differential amplifier and light emitting element driving device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8587372B2 (en) |
| JP (1) | JP2011254147A (en) |
| CN (1) | CN102299691A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888155A (en) * | 2017-12-27 | 2018-04-06 | 苏州菲达旭微电子有限公司 | A kind of multi input amplifier and the dual control circuit including the amplifier |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5979160B2 (en) * | 2014-01-06 | 2016-08-24 | 株式会社村田製作所 | amplifier |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0431447A (en) | 1990-05-28 | 1992-02-03 | Asahi Chem Ind Co Ltd | Flame-retarding resin foam particle of excellent heat insulation property |
| US6489845B1 (en) | 2000-04-04 | 2002-12-03 | Goodrich Corporation | Multiplexing amplifier |
| JP4177022B2 (en) | 2002-05-07 | 2008-11-05 | ローム株式会社 | LIGHT EMITTING ELEMENT DRIVE DEVICE AND ELECTRONIC DEVICE HAVING LIGHT EMITTING ELEMENT |
| JP2004020867A (en) | 2002-06-14 | 2004-01-22 | Fuji Photo Film Co Ltd | Lens-fitted photographic film unit and its manufacturing method |
| US6690146B2 (en) | 2002-06-20 | 2004-02-10 | Fairchild Semiconductor Corporation | High efficiency LED driver |
| JP2004200867A (en) | 2002-12-17 | 2004-07-15 | Sony Corp | Operational amplifier, offset voltage regulating system, and method for manufacturing operational amplifier |
| US6807118B2 (en) | 2003-01-23 | 2004-10-19 | Hewlett-Packard Development Company, L.P. | Adjustable offset differential amplifier |
| KR100698332B1 (en) * | 2005-02-04 | 2007-03-23 | 삼성전자주식회사 | Gain Control Amplifier |
| JP4657799B2 (en) | 2005-05-11 | 2011-03-23 | 株式会社リコー | Light emitting diode drive circuit |
| WO2009022531A1 (en) * | 2007-08-13 | 2009-02-19 | Nec Corporation | Data compression/decompression method |
-
2010
- 2010-05-31 JP JP2010124902A patent/JP2011254147A/en not_active Withdrawn
-
2011
- 2011-05-30 CN CN2011101428747A patent/CN102299691A/en active Pending
- 2011-05-31 US US13/149,218 patent/US8587372B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888155A (en) * | 2017-12-27 | 2018-04-06 | 苏州菲达旭微电子有限公司 | A kind of multi input amplifier and the dual control circuit including the amplifier |
| CN107888155B (en) * | 2017-12-27 | 2024-04-02 | 苏州菲达旭微电子有限公司 | Multiple-input amplifier and double-control circuit comprising same |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110291589A1 (en) | 2011-12-01 |
| JP2011254147A (en) | 2011-12-15 |
| US8587372B2 (en) | 2013-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20100156521A1 (en) | Constant switch vgs circuit for minimizing rflatness and improving audio performance | |
| TW200707158A (en) | Constant current circuit | |
| CN102298412B (en) | Current generation circuit and reference voltage circuit using the same | |
| CN201813159U (en) | Power parallel machine flow equalization circuit with bidirectional adjustable output voltage | |
| US9407221B2 (en) | Differential amplifier circuit | |
| CN107548202A (en) | Voltage current transformating circuit and load driving circuits | |
| CN101739054A (en) | Active current limiting circuit and power supply regulator using same | |
| JP5481281B2 (en) | Current driving circuit and light emitting device using the same | |
| CN208353304U (en) | Current sense amplifier and general-purpose serial bus USB port | |
| CN103138579A (en) | Phase compensated circuit, semiconductor integrated circuit with same and power supply circuit | |
| US9559648B2 (en) | Amplifier with reduced idle power loss using single-ended loops | |
| CN103095231A (en) | Novel common mode feedback circuit | |
| CN102299691A (en) | Multi-input differential amplifier and light emitting element driving device | |
| CN1697314A (en) | Sampling signal amplifier | |
| CN104424879B (en) | To the insensitive constant transconductance biasing circuit of power source change and its display | |
| CN102395234B (en) | Low voltage CMOS constant current source circuit with high matching degree | |
| CN103546106A (en) | Signal amplification circuit | |
| CN103219947A (en) | Voltage regulator | |
| CN102571004A (en) | Operational amplifier | |
| CN103138704B (en) | It is suitable for the voltage control variable resistor of big scale signal application | |
| US9899964B2 (en) | Class AB amplifier with bias control | |
| CN109313158A (en) | Semiconductor device and cell potential measuring device | |
| CN107645280A (en) | High speed amplifying circuit | |
| CN203326961U (en) | Electrical level switching circuit with high gain | |
| CN203537322U (en) | Weak photoelectric signal amplification circuit and processing board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111228 |